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Improved documentation of avoid crossing perimeters algorithm.

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This commit is contained in:
Lukáš Hejl 2020-10-07 14:52:57 +02:00
parent 46bae74e48
commit 5c073d0ddb
1 changed files with 6 additions and 0 deletions
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6
src/libslic3r/GCode.cpp
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@ -178,6 +178,7 @@ namespace Slic3r {
return islands;
}
// Create a rotation matrix for projection on the given vector
static Matrix2d rotation_by_direction(const Point &direction)
{
Matrix2d rotation;
@ -188,6 +189,7 @@ namespace Slic3r {
return rotation;
}
// Returns a direction of the shortest path along the polygon boundary
AvoidCrossingPerimeters2::Direction AvoidCrossingPerimeters2::get_shortest_direction(const Lines &lines,
const size_t start_idx,
const size_t end_idx,
@ -253,6 +255,7 @@ namespace Slic3r {
optimized_comb_path.points.reserve(travel.points.size());
optimized_comb_path.points.emplace_back(travel.points.front());
// Try to skip some points in the path.
for (size_t point_idx = 1; point_idx < travel.size(); point_idx++) {
const Point &current_point = travel.points[point_idx - 1];
Point next = travel.points[point_idx];
@ -262,6 +265,7 @@ namespace Slic3r {
for (size_t point_idx_2 = point_idx + 1; point_idx_2 < travel.size(); point_idx_2++) {
visitor.pt_next = &travel.points[point_idx_2];
m_grid.visit_cells_intersecting_line(*visitor.pt_current, *visitor.pt_next, visitor);
// Check if deleting point causes crossing a boundary
if (!visitor.intersect) {
next = travel.points[point_idx_2];
point_idx = point_idx_2;
@ -359,6 +363,7 @@ namespace Slic3r {
return (normal_1 + normal_2).normalized();
};
// Compute offset of polygon's in a direction inward normal
static Point get_polygon_vertex_offset(const Polygon &polygon, const size_t point_idx, const int offset)
{
return polygon.points[point_idx] + (get_polygon_vertex_inward_normal(polygon, point_idx) * double(offset)).cast<coord_t>();
@ -446,6 +451,7 @@ namespace Slic3r {
Direction shortest_direction = get_shortest_direction(border_lines, intersection_first.line_idx, intersection_second.line_idx,
intersection_first_point, intersection_second_point);
// Append the path around the border into the path
// Offset of the polygon's point is used to simplify calculation of intersection between boundary
if (shortest_direction == Direction::Forward)
for (int line_idx = intersection_first.line_idx; line_idx != int(intersection_second.line_idx);
line_idx = (((line_idx + 1) < int(border_lines.size())) ? (line_idx + 1) : 0))